Mold for matrix setting and typeline casting machines



Aug, 1, 1933 E. UHTHOFF 332M442? MOLD FOR MATRIX SETTING AND TYPE LINE CASTING MACHINES Filed June 14, 1932 FIG. 4 PEG. 3 PEG. 5 Jzwwafm':

Patented Aug. 1 1933 PATENT" orrics.

MOLD ron MATRIX SETTING .AND' TYPE- LINETCASTING MACHINES Eduard Uhthoff, BerlinCharlottenburg, Germany, assignor to Typograph G. In. H, Berlin, Germany Application June 14, 1932, Serial No.61i,l78, and in Germany August 11, 1931 6 Claims. '(Cl; 199-55) The invention relates to a casting mold ,for matrix-composing and line-casting machines, having a metal part inserted in about the middle of the casting slit. This part, which will be 5 called hereinafter the stay, is intended to ensure the distance apart of the lateral checks of the casting mold and more particularly to prevent the, said cheeks warping whenzthe hot metal is injected and 50 causing the casting slit to contract. At the same time, the lateral cheeks are so held together by a screw passing through them that they are also unable to bend outwardly and cause the casting slit to widen. This device is known and was devised when difilcultes occurred through the heating of the lateral checks.

The lines made in practice with such casting molds, however, exhibit obscure places, especially in the middle of the typeface. The type face is not clean, and prolonged experiments were nec essary before the cause of this defect was found to be in the form of the stay. On close examination, it was found that the material of the cast line in places situated above the stay is less dense than at places situatedfarther away from the stay. Often porous, even blistery places are found above the stay. This smaller density of the line material constitutes the cause for the indistinct printing which the cast lines provide at their middle. Further investigations have shown that the discovered reduction in the density of the material are due to an eddy formation of the liquid metal flowing into the casting slit of the eddies such that they tend to draw the material above the stay from the middle of line towards the sides. The explanation for the aforementioned disadvantages was thereby found and the method for their elimination was indicated.

The most satisfactory ing the subject matter found as the result of This form of stay allows the. liquid metal to flow without eddy formation in such a manner into the casting slit that it does not rush away from the lateral walls of the stay, but on the contrary also flows towards the middle of the line situated above the stay with the same velocity and at the same pressure as in the other parts of the casting slit. The real purpose of the stay to prevent form of stay, constitutof the invention, was 'ensive experiments.

inward bending of the lateral cheeks of the casting mold. is not prejudiced by the form of stay according to this invention. The lines cast with a casting mold according to the invention exhibit the samedensity of material both in the middle and at the sides and provide a uniform and satisfactorily clear printing over the entire length of the type face.

The stay according to the invention is made with its bottom edge of the least permissible width which is determined by its purpose as a distance piece. An original formis selected for the in movable fixing of the stay to one of the lateral cheeks so as to obviate the necessity of increasing the width of the stay on account of the said fixing, as is thecase with the stay employed heretofore. The stay according to this invention therefore is only about 4.5 millimeters thick at its widest place, and in order to facilitate the ejection of the cast line, the stay is also slightly tapered, about millimeter on each side, in the direction of admission of the metal. This very slight taper is also found to be necessary forobviating eddy formation, since with the more pronounced taper customary heretofore, the liquid metal rushes away from the lateral walls.

A constructional example of the invention is shown in the accompanying drawing, in which: Figure- 1 shows diagrammatically a casting mold of the construction employed heretofore with a wide stay considerably tapered on the side walls, the eddy formation being also indicated.

Figure 2 shows a casting mold according to the invention with a narrow stay.

Figure 3 shows a cross-section through the casting mold along the line III-III in Figure 2 on a larger scale, the intermediate plate situated between the casting moldand casting mouth and indicated in Figures 1 and 2 being omitted for the sake of clearness.

Figure 4 shows a plan, and

Figure 5 is a side elevation of the stay.

The lateral checks 1 of the casting mold are held together with the intermediate pieces 3 limiting the length of the line in the usual manner by screw bolts 2. The stay 4 is immovably fixed to one of the lateral cheeks at about the middle of the casting slit. A screw 5 is passed through a bore in the two lateral cheeks 1 and the stay 4, or is inserted with a screw-thread into one of the lateral cheeks so that in the tightened condition it presses both lateral checks 1 firmly against the intermediately situated stay 4. The corresponding bore 6 of the stay 4 has a larger diameter than the screw 5, so that there is a clearance between the latter and the bore 6. The screw 5 is intended merely to press the lateral checks 1 together, and the stay 4 is intended merely to hold the cheeks 1 away from one another at their fixed distance apart. The stay 4, by means of a lug 7 corresponding to its width in a recess 8 of the cheek l, bears against the said cheek. A bore 9 passes through both the stay 4 and the cheek l and a pin 10, which is pressed into this bore, ensures, in combination withthe lug 7, for the stay 4 a position which is immovable in any direction. In the event of any necessity to loosen the stay 4, it is only necessary to drive the pin 10 out through the bore 9. This original fixing andsecuring of the stay 4 to one of the lateral checks by means of the lug '7 and only one dowel pin 10 without a fixing screw enables the stay. to be made as narrow as possible. On this bottom edge, that is to say, at the widest place,the stay is only 4.5 millimeters thick and, as previously mentioned, it is Very slightly taperedupwardly, in order to ensure that the cast lines may be ejected smoothly. Its width measured above the middle of the bore 6 is only about 4.3 millimeters. The

, screw 5 which is about 3 millimeters thick should Due to the form given to the stay 4 as shown,

- the type metal issuing from the casting mouth,

not shown on the drawing, can enter through the intermediate plate 11 into the casting slit of the casing mold Without the occurrence of eddy formations and the defects caused thereby in the cast lines.

Having thus fully described the invention what is claimed as new and desired to be secured by Letters Patent is:

1. A casting mold for matrix-composing and line-casting machines including a pair of lateral cheeks spaced apart at their ends so as to leave a casting slit, a distance stay inserted in the casting slit and firmly secured to one of the cheeks of the casting mold, the stay extending to about half the depth of the casting slit and being of a very narrow widthoi about 4.5 millimeters and also having a very slight taper of approximately millimeter on each side from the base to the middle of the line.

2. A casting mold for matrix-composing and line-casting machines as claimed in claim 1, wherein the stay has its widest bottom edge situated perpendicularly to the direction of admission of the type metal.

3. A casting mold for matrix-composing and line-casting machines as claimed in claim 1, wherein one of the cheeks is provided with a recess, a lug extending from the stay and corresponding to its width and seated in said recess, and a single pin removably engaged in the recessed cheek and the stay for cooperating with the lug for immovably holding the stay in position.

4. A casting mold for matrix-composing and line-casting machines as claimed in claim 1, wherein the stay is provided with a bore and a screw serving to hold together the lateral cheeks in the middle of the casting slit of the casting mold and passing with clearance through the bore of the stay.

5. A casting mold for matrix-composing and line-casting machines including a pair of lateral cheeks spaced apart at their ends so as to leave a casting slit, one of said cheeks having a recess therein, a distance stay of narrow width inserted in the casting slit and extending to about onehalf the depth of the slit, a lug extending from I the stay and corresponding to its width and seated in its recess, and a single pin removably engaged in the recessed cheek and the stay for 00- operating with the lug for immovably holding the stay in position.

6. A casting mold iormatrix composing and line-casting machines including a pair of lateral cheeks spaced apart at their ends so as to leave a casting slit, a distance stay of narrow, width inserted in the casting slit and firmly secured T to one of the checks of the casting mold, the stay extending to about one-half the depth of the casting slit and provided with a bore, and a screw serving to hold together the lateral cheeks in the middle of the casting slit of the casting mold and passing with clearance through the bore of the stay. I

EDUARD UHTHOFF. 

